Vacuum insulated panel for counteracting vacuum bow induced deformations
A vacuum insulated cabinet structure includes first and second cover members having pre-deformed portions and perimeter portions. The perimeter portions of the first and second cover members are disposed along first and second planar levels and the pre-deformed portions of the first and second cover members include portions thereof extending outwardly relative to the first and second planar levels. A thermal bridge interconnects the first cover member and the second cover member at the perimeter portions thereof to define an insulating cavity therebetween. The insulating cavity is a sealed cavity having a vacuum drawn therefrom. The pre-deformed portions of the first and second cover members move inwardly towards the first and second planar levels under a force of the vacuum within the insulating cavity.
1. A method of making a vacuum insulated structure, the method comprising:
providing first and second cover members, wherein the first and second cover members are sheet metal cover members;
pre-deforming the first and second cover members in a sheet metal stamping process to form pre-deformed portions on each of the first and second cover members, wherein the pre-deformed portion of the first cover member extends outwardly from a first planar level of the first cover member, and further wherein the pre-deformed portion of the second cover member extends outwardly from a second planar level of the second cover member, and further wherein the sheet metal stamping process provides inclined weakened portions on the first and second cover members;
operably coupling the first and second cover members to one another to form an insulating cavity therebetween;
introducing an insulation material into the insulating cavity;
drawing a vacuum on the insulating cavity;
drawing the pre-deformed portions of the first and second cover members inwardly towards the first and second planar levels of the first and second cover members, respectively, under a force provided by the vacuum; and
sealing the insulating cavity to maintain the vacuum.
2. The method of claim 1 , wherein the step of drawing the vacuum includes drawing a vacuum of less than 10 mbar within the insulating cavity.
3. The method of claim 1 , including the step of:
introducing an insulation material into the insulating cavity, the insulation material having a thermal conductivity of 5 mW/mK or lower.